Make fetch-pack a builtin with an internal API
[git/git.git] / git.c
diff --git a/git.c b/git.c
index 29b55a1..6ca36c0 100644 (file)
--- a/git.c
+++ b/git.c
@@ -4,7 +4,7 @@
 #include "quote.h"
 
 const char git_usage_string[] =
-       "git [--version] [--exec-path[=GIT_EXEC_PATH]] [-p|--paginate] [--bare] [--git-dir=GIT_DIR] [--help] COMMAND [ARGS]";
+       "git [--version] [--exec-path[=GIT_EXEC_PATH]] [-p|--paginate|--no-pager] [--bare] [--git-dir=GIT_DIR] [--work-tree=GIT_WORK_TREE] [--help] COMMAND [ARGS]";
 
 static void prepend_to_path(const char *dir, int len)
 {
@@ -28,7 +28,7 @@ static void prepend_to_path(const char *dir, int len)
        free(path);
 }
 
-static int handle_options(const char*** argv, int* argc)
+static int handle_options(const char*** argv, int* argc, int* envchanged)
 {
        int handled = 0;
 
@@ -58,20 +58,45 @@ static int handle_options(const char*** argv, int* argc)
                        }
                } else if (!strcmp(cmd, "-p") || !strcmp(cmd, "--paginate")) {
                        setup_pager();
+               } else if (!strcmp(cmd, "--no-pager")) {
+                       setenv("GIT_PAGER", "cat", 1);
+                       if (envchanged)
+                               *envchanged = 1;
                } else if (!strcmp(cmd, "--git-dir")) {
                        if (*argc < 2) {
                                fprintf(stderr, "No directory given for --git-dir.\n" );
                                usage(git_usage_string);
                        }
                        setenv(GIT_DIR_ENVIRONMENT, (*argv)[1], 1);
+                       if (envchanged)
+                               *envchanged = 1;
                        (*argv)++;
                        (*argc)--;
                        handled++;
                } else if (!prefixcmp(cmd, "--git-dir=")) {
                        setenv(GIT_DIR_ENVIRONMENT, cmd + 10, 1);
+                       if (envchanged)
+                               *envchanged = 1;
+               } else if (!strcmp(cmd, "--work-tree")) {
+                       if (*argc < 2) {
+                               fprintf(stderr, "No directory given for --work-tree.\n" );
+                               usage(git_usage_string);
+                       }
+                       setenv(GIT_WORK_TREE_ENVIRONMENT, (*argv)[1], 1);
+                       if (envchanged)
+                               *envchanged = 1;
+                       (*argv)++;
+                       (*argc)--;
+               } else if (!prefixcmp(cmd, "--work-tree=")) {
+                       setenv(GIT_WORK_TREE_ENVIRONMENT, cmd + 12, 1);
+                       if (envchanged)
+                               *envchanged = 1;
                } else if (!strcmp(cmd, "--bare")) {
                        static char git_dir[PATH_MAX+1];
-                       setenv(GIT_DIR_ENVIRONMENT, getcwd(git_dir, sizeof(git_dir)), 1);
+                       is_bare_repository_cfg = 1;
+                       setenv(GIT_DIR_ENVIRONMENT, getcwd(git_dir, sizeof(git_dir)), 0);
+                       if (envchanged)
+                               *envchanged = 1;
                } else {
                        fprintf(stderr, "Unknown option: %s\n", cmd);
                        usage(git_usage_string);
@@ -150,7 +175,7 @@ static int split_cmdline(char *cmdline, const char ***argv)
 
 static int handle_alias(int *argcp, const char ***argv)
 {
-       int nongit = 0, ret = 0, saved_errno = errno;
+       int nongit = 0, envchanged = 0, ret = 0, saved_errno = errno;
        const char *subdir;
        int count, option_count;
        const char** new_argv;
@@ -161,6 +186,21 @@ static int handle_alias(int *argcp, const char ***argv)
        git_config(git_alias_config);
        if (alias_string) {
                if (alias_string[0] == '!') {
+                       if (*argcp > 1) {
+                               int i, sz = PATH_MAX;
+                               char *s = xmalloc(sz), *new_alias = s;
+
+                               add_to_string(&s, &sz, alias_string, 0);
+                               free(alias_string);
+                               alias_string = new_alias;
+                               for (i = 1; i < *argcp &&
+                                       !add_to_string(&s, &sz, " ", 0) &&
+                                       !add_to_string(&s, &sz, (*argv)[i], 1)
+                                       ; i++)
+                                       ; /* do nothing */
+                               if (!sz)
+                                       die("Too many or long arguments");
+                       }
                        trace_printf("trace: alias to shell cmd: %s => %s\n",
                                     alias_command, alias_string + 1);
                        ret = system(alias_string + 1);
@@ -171,7 +211,11 @@ static int handle_alias(int *argcp, const char ***argv)
                            alias_string + 1, alias_command);
                }
                count = split_cmdline(alias_string, &new_argv);
-               option_count = handle_options(&new_argv, &count);
+               option_count = handle_options(&new_argv, &count, &envchanged);
+               if (envchanged)
+                       die("alias '%s' changes environment variables\n"
+                                "You can use '!git' in the alias to do this.",
+                                alias_command);
                memmove(new_argv - option_count, new_argv,
                                count * sizeof(char *));
                new_argv -= option_count;
@@ -214,37 +258,83 @@ const char git_version_string[] = GIT_VERSION;
  * require working tree to be present -- anything uses this needs
  * RUN_SETUP for reading from the configuration file.
  */
-#define NOT_BARE       (1<<2)
+#define NEED_WORK_TREE (1<<2)
 
-static void handle_internal_command(int argc, const char **argv, char **envp)
+struct cmd_struct {
+       const char *cmd;
+       int (*fn)(int, const char **, const char *);
+       int option;
+};
+
+static int run_command(struct cmd_struct *p, int argc, const char **argv)
+{
+       int status;
+       struct stat st;
+       const char *prefix;
+
+       prefix = NULL;
+       if (p->option & RUN_SETUP)
+               prefix = setup_git_directory();
+       if (p->option & USE_PAGER)
+               setup_pager();
+       if (p->option & NEED_WORK_TREE) {
+               const char *work_tree = get_git_work_tree();
+               const char *git_dir = get_git_dir();
+               if (!is_absolute_path(git_dir))
+                       set_git_dir(make_absolute_path(git_dir));
+               if (!work_tree || chdir(work_tree))
+                       die("%s must be run in a work tree", p->cmd);
+       }
+       trace_argv_printf(argv, argc, "trace: built-in: git");
+
+       status = p->fn(argc, argv, prefix);
+       if (status)
+               return status;
+
+       /* Somebody closed stdout? */
+       if (fstat(fileno(stdout), &st))
+               return 0;
+       /* Ignore write errors for pipes and sockets.. */
+       if (S_ISFIFO(st.st_mode) || S_ISSOCK(st.st_mode))
+               return 0;
+
+       /* Check for ENOSPC and EIO errors.. */
+       if (fflush(stdout))
+               die("write failure on standard output: %s", strerror(errno));
+       if (ferror(stdout))
+               die("unknown write failure on standard output");
+       if (fclose(stdout))
+               die("close failed on standard output: %s", strerror(errno));
+       return 0;
+}
+
+static void handle_internal_command(int argc, const char **argv)
 {
        const char *cmd = argv[0];
-       static struct cmd_struct {
-               const char *cmd;
-               int (*fn)(int, const char **, const char *);
-               int option;
-       } commands[] = {
-               { "add", cmd_add, RUN_SETUP | NOT_BARE },
-               { "annotate", cmd_annotate, RUN_SETUP | USE_PAGER },
+       static struct cmd_struct commands[] = {
+               { "add", cmd_add, RUN_SETUP | NEED_WORK_TREE },
+               { "annotate", cmd_annotate, RUN_SETUP },
                { "apply", cmd_apply },
                { "archive", cmd_archive },
                { "blame", cmd_blame, RUN_SETUP },
                { "branch", cmd_branch, RUN_SETUP },
                { "bundle", cmd_bundle },
                { "cat-file", cmd_cat_file, RUN_SETUP },
-               { "checkout-index", cmd_checkout_index, RUN_SETUP },
+               { "checkout-index", cmd_checkout_index,
+                       RUN_SETUP | NEED_WORK_TREE},
                { "check-ref-format", cmd_check_ref_format },
-               { "check-attr", cmd_check_attr, RUN_SETUP | NOT_BARE },
+               { "check-attr", cmd_check_attr, RUN_SETUP | NEED_WORK_TREE },
                { "cherry", cmd_cherry, RUN_SETUP },
-               { "cherry-pick", cmd_cherry_pick, RUN_SETUP | NOT_BARE },
+               { "cherry-pick", cmd_cherry_pick, RUN_SETUP | NEED_WORK_TREE },
                { "commit-tree", cmd_commit_tree, RUN_SETUP },
                { "config", cmd_config },
                { "count-objects", cmd_count_objects, RUN_SETUP },
                { "describe", cmd_describe, RUN_SETUP },
-               { "diff", cmd_diff, USE_PAGER },
+               { "diff", cmd_diff },
                { "diff-files", cmd_diff_files },
                { "diff-index", cmd_diff_index, RUN_SETUP },
                { "diff-tree", cmd_diff_tree, RUN_SETUP },
+               { "fetch-pack", cmd_fetch_pack, RUN_SETUP },
                { "fetch--tool", cmd_fetch__tool, RUN_SETUP },
                { "fmt-merge-msg", cmd_fmt_merge_msg, RUN_SETUP },
                { "for-each-ref", cmd_for_each_ref, RUN_SETUP },
@@ -255,6 +345,9 @@ static void handle_internal_command(int argc, const char **argv, char **envp)
                { "get-tar-commit-id", cmd_get_tar_commit_id },
                { "grep", cmd_grep, RUN_SETUP | USE_PAGER },
                { "help", cmd_help },
+#ifndef NO_CURL
+               { "http-fetch", cmd_http_fetch, RUN_SETUP },
+#endif
                { "init", cmd_init_db },
                { "init-db", cmd_init_db },
                { "log", cmd_log, RUN_SETUP | USE_PAGER },
@@ -264,10 +357,10 @@ static void handle_internal_command(int argc, const char **argv, char **envp)
                { "mailsplit", cmd_mailsplit },
                { "merge-base", cmd_merge_base, RUN_SETUP },
                { "merge-file", cmd_merge_file },
-               { "mv", cmd_mv, RUN_SETUP | NOT_BARE },
+               { "mv", cmd_mv, RUN_SETUP | NEED_WORK_TREE },
                { "name-rev", cmd_name_rev, RUN_SETUP },
                { "pack-objects", cmd_pack_objects, RUN_SETUP },
-               { "pickaxe", cmd_blame, RUN_SETUP | USE_PAGER },
+               { "pickaxe", cmd_blame, RUN_SETUP },
                { "prune", cmd_prune, RUN_SETUP },
                { "prune-packed", cmd_prune_packed, RUN_SETUP },
                { "push", cmd_push, RUN_SETUP },
@@ -275,21 +368,24 @@ static void handle_internal_command(int argc, const char **argv, char **envp)
                { "reflog", cmd_reflog, RUN_SETUP },
                { "repo-config", cmd_config },
                { "rerere", cmd_rerere, RUN_SETUP },
+               { "reset", cmd_reset, RUN_SETUP },
                { "rev-list", cmd_rev_list, RUN_SETUP },
                { "rev-parse", cmd_rev_parse, RUN_SETUP },
-               { "revert", cmd_revert, RUN_SETUP | NOT_BARE },
-               { "rm", cmd_rm, RUN_SETUP | NOT_BARE },
-               { "runstatus", cmd_runstatus, RUN_SETUP | NOT_BARE },
+               { "revert", cmd_revert, RUN_SETUP | NEED_WORK_TREE },
+               { "rm", cmd_rm, RUN_SETUP | NEED_WORK_TREE },
+               { "runstatus", cmd_runstatus, RUN_SETUP | NEED_WORK_TREE },
                { "shortlog", cmd_shortlog, RUN_SETUP | USE_PAGER },
                { "show-branch", cmd_show_branch, RUN_SETUP },
                { "show", cmd_show, RUN_SETUP | USE_PAGER },
                { "stripspace", cmd_stripspace },
                { "symbolic-ref", cmd_symbolic_ref, RUN_SETUP },
+               { "tag", cmd_tag, RUN_SETUP },
                { "tar-tree", cmd_tar_tree },
                { "unpack-objects", cmd_unpack_objects, RUN_SETUP },
                { "update-index", cmd_update_index, RUN_SETUP },
                { "update-ref", cmd_update_ref, RUN_SETUP },
                { "upload-archive", cmd_upload_archive },
+               { "verify-tag", cmd_verify_tag, RUN_SETUP },
                { "version", cmd_version },
                { "whatchanged", cmd_whatchanged, RUN_SETUP | USE_PAGER },
                { "write-tree", cmd_write_tree, RUN_SETUP },
@@ -307,25 +403,13 @@ static void handle_internal_command(int argc, const char **argv, char **envp)
 
        for (i = 0; i < ARRAY_SIZE(commands); i++) {
                struct cmd_struct *p = commands+i;
-               const char *prefix;
                if (strcmp(p->cmd, cmd))
                        continue;
-
-               prefix = NULL;
-               if (p->option & RUN_SETUP)
-                       prefix = setup_git_directory();
-               if (p->option & USE_PAGER)
-                       setup_pager();
-               if ((p->option & NOT_BARE) &&
-                               (is_bare_repository() || is_inside_git_dir()))
-                       die("%s must be run in a work tree", cmd);
-               trace_argv_printf(argv, argc, "trace: built-in: git");
-
-               exit(p->fn(argc, argv, prefix));
+               exit(run_command(p, argc, argv));
        }
 }
 
-int main(int argc, const char **argv, char **envp)
+int main(int argc, const char **argv)
 {
        const char *cmd = argv[0] ? argv[0] : "git-help";
        char *slash = strrchr(cmd, '/');
@@ -358,14 +442,14 @@ int main(int argc, const char **argv, char **envp)
        if (!prefixcmp(cmd, "git-")) {
                cmd += 4;
                argv[0] = cmd;
-               handle_internal_command(argc, argv, envp);
+               handle_internal_command(argc, argv);
                die("cannot handle %s internally", cmd);
        }
 
        /* Look for flags.. */
        argv++;
        argc--;
-       handle_options(&argv, &argc);
+       handle_options(&argv, &argc, NULL);
        if (argc > 0) {
                if (!prefixcmp(argv[0], "--"))
                        argv[0] += 2;
@@ -377,11 +461,11 @@ int main(int argc, const char **argv, char **envp)
        cmd = argv[0];
 
        /*
-        * We search for git commands in the following order:
-        *  - git_exec_path()
-        *  - the path of the "git" command if we could find it
-        *    in $0
-        *  - the regular PATH.
+        * We execute external git command via execv_git_cmd(),
+        * which looks at "--exec-path" option, GIT_EXEC_PATH
+        * environment, and $(gitexecdir) in Makefile while built,
+        * in this order.  For scripted commands, we prepend
+        * the value of the exec_path variable to the PATH.
         */
        if (exec_path)
                prepend_to_path(exec_path, strlen(exec_path));
@@ -390,7 +474,7 @@ int main(int argc, const char **argv, char **envp)
 
        while (1) {
                /* See if it's an internal command */
-               handle_internal_command(argc, argv, envp);
+               handle_internal_command(argc, argv);
 
                /* .. then try the external ones */
                execv_git_cmd(argv);